There's Toonz and Animo, that are used at the studios I work for: complete solutions for Ink and Paint, coloring and compositing, but they are prohibitely expensive. (They will render out to feature film movie quality, though)
Chromacolour CTP is a bit less fancy, and a bit cheaper (although still expensive for normal users, and mainly used for TV productions. Just checked their website and they seem to have cheaper student versions as well, going up from $99,-; you might want to check that out)

I know Mirage from its previous incarnation, NewTek Aura - the first version of this program was a giveaway on a Digit magazine CD a couple of years ago. It is nice for animating directly into the computer with a Wacom tablet, it offers an onion skin light table mode and unlimited layers, but the version I used had no real dopesheet function.
It has a twain driver, so you can scan animation drawings directly into the program.

Take5 is a standalone linetester for the PC without coloring or compositing: so is Ernest.

Digicel Flipbook is mainly a linetester as well, but offers additional coloring capacity. It is still affordable, but it is a bit picky about the capture cards it needs.

As for userfriendlyness I would only know about the linetester parts of the programs: I never had to do my own coloring or compositing, as these are specialized jobs; I stick to pencil animation only.

Message edited on: 09/23/2005 05:45

Message edited on: 09/23/2005 05:49